The abrupt departure of Mohamed El-Erian as CEO of bond-fund megalith Pimco this week sparked much head-scratching amongst the financial press. Bill Gross, Pimco’s founder and managing director, told the Wall Street Journal that he didn’t want El-Erian to leave (paywall), but the Financial Times reports that a “frequently fractious” relationship (paywall) between Gross and El-Erian was part of the reason he departed.